A.冷脆 B.熱脆 C.氫脆
A.0.0218%~2.11% B.0.0218%~0.77% C.0.20%~0.60% D.0.60%~0.80%
A.低溫回火 B.高溫回火 C.中溫回火 D.低溫退火